Description / Abstract:

This International Standard specifies methods of determining
light and energy transmittance of solar radiation for glazing in
buildings. These characteristic data can serve as a basis for
light, heating and ventilation calculations of rooms and can permit
comparison between different types of glazing.

This International Standard is applicable both to conventional
glazing units and to absorbing or reflecting solar-control glazing,
used as glazed apertures. The appropriate formulae for single,
double and triple glazing are given. Furthermore, the general
calculation procedures for units consisting of more than components
are established.

This International Standard is applicable to all transparent
materials. One exception is the treatment of the secondary heat
transfer factor and the total solar energy factor for those
materials that show significant transmittance in the wavelength
region of ambient temperature radiation (5 μm to 50 μm), such as
certain plastic sheets.

NOTE For multiple glazing including elements with
light-scattering properties, the more detailed procedures of ISO
15099 can be used. For daylighting calculations, procedures can be
found in reference [1].